DE10015666A1 - Method for capturing, separating and aspirating fluids using frontal turbulence generators with one arranged in arbitrary direction or several arranged and combined with aspiration slots - Google Patents

Abstract

A single frontal turbulence generator which can be attached to another device on one of its lower faces is arranged in a location in arbitrary direction, or frontal turbulence generators are arranged as required in arbitrary manner and are combined with one another. At least one generator is optionally combined with aspiration slots and/or orifices. At least one generator can be used to produce curved or straight line air screens and one can be used with stationary or movable control elements before or after the air outlet.

Description

The invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 18, and is based on the Ver Use of frontal vortex generators to generate flow fields for the Limitation, detection and extraction of pollutants in fluid media.

A frontal vortex generator is understood to mean a blow-out device which is connected to a Wall creates a frontal flow over a certain length.

A fluid medium, the density of which is greater or less than the density of the environment is, decreases or rises (thermal beam / convection) and spreads over or under a surface flowing apart (density flow). The flow principle of Frontal vortex generators are in DE 196 13 513.3 with respect to an underside wrote. For the separation of rooms with different climatic conditions This means that the equalizing flows between these two spaces men prefer the horizontal boundary surfaces, namely ceiling and floor, but also on the vertical boundary surfaces, namely the walls of these rooms, occur.

The patents DE 39 18 870 and 42 03 916 and the patent application. DE 196 13 513.3 and 199 11 850.7 describe embodiments and blow-out configurations in the Near a wall to limit eddy or curved shear currents witness that block the outflowing density flows and on the suction to move. This process is known as the frontal swirl process.  

This prior art assumes that the flow after Leaving frontal vortex generators essentially below an area, e.g. B. an underside of an extractor hood, runs. These patents also relate only on devices with a single frontal vortex generator.

A frontal vortex generator is a blow-out device that is connected generated frontal flow structure. Such a flow can be blown out generated from slots or through a plurality of blow-out openings. The Blow-out slots or perforated strips of these frontal vortex generators can be straight or be curved. Frontal blow-out devices are then not included connected to each other when they are not on the same surface or if their flow fields with a common surface directly on this upper area not connected; in this case there are two frontal vertebrae generators.

DE 196 13 513.3 describes the difference between an air curtain and one Frontal flow. Air curtains or beam seals have hardly been found in recent times more use with extractor hoods because they have a capturing effect on one Do not significantly increase the interface. In contrast, these methods are at Türabdich tion, for sealing ovens or cold chambers in production lines, or used to demarcate rooms of different climatic conditions Lich. This is useful if there are openings through which one continuous succession of devices, people or tampering can, e.g. B. in production lines, department store doors, laboratory workplaces or kitchens. The penetration depth of the beam seal in a room is greater than with frontal swirls method.

For laboratory fume cupboards, the so-called "roller fume cupboard" is currently used as the standard fume cupboard turns in which an air roller is created in the upper storage space. The air circulation in the Storage space runs up the back wall and on the front edge with a slide downward. A targeted positioning of the suction elements, e.g. B. front in the upper  Area of the ceiling and in the lower area of the rear wall, such a roller should allow flow. This can be done by inflow profiling, e.g. B. according to EP 486971, can be reached when entering the suction housing. Furthermore describes e.g. B. EP 687512 a trigger with an air emerging from the sliding window veil.

The additional structuring of the flow in a fume cupboard or suction cupboard by means of blowouts and / or targeted suction results, for. B. from following publications: DE 34 04 775, DE 32 32 203, DE 27 58 348, EP 487342 (wall jets), DE 34 31 669, DE 32 08 622 (air curtain); DE 34 04 775, DE 32 32 203, DE 32 08 622 (confluence vortex flows).

The object of the invention is, in particular, using frontal vortex generators for laboratory fume cupboards, island extractor hoods and the like. The extraction of pollutants to improve in fluid media.

According to the invention, this is done in a method according to the An award 1 or claim 2 and with a device with the indicator of claim 18 achieved and proposed frontal vortex generators for suction of pollutants in flows of fluid media that are lighter or heavier than air are able to orientate and combine as desired in the room, e.g. B. the effect activity of known standard roller deductions with the help of frontal vortex generators increase. In addition to a frontal flow consisting of many small there is a single hole blow-out, a combination with frontal vortex genera gates made. For a single frontal vortex generator, a be random orientation in space, with the exception of a bottom suggested. By the targeted combination of suction elements, e.g. B. area suction, point suction and slot suction devices with the air outlet elements, the flow structure in free, partially closed or completely closed rooms true and controlled.  

Furthermore, the invention provides a detection method for near and free walls Spaces straight air curtains with beam sealing and curved air curtains with or proposed without frontal vertebrae. The combination of frontal currents and air curtains result in a delimitation effect on surfaces and in addition larger in penetration depth of the flow into the room. This allows air outlets for frontal Combine currents and air curtains. On the other hand, it is also possible Lich to let air curtains emerge from frontal vortex generators. As long as a strength Re influencing the blown jet by the wall or beam effects stands, the beam is curved so that a curved air curtain is created. The more this influence is reduced, the more straightforward the air curtain becomes. The ex Extremely strong, curved towards the wall is a frontal flow.

For setting the frontal flow emerging from the frontal vortex generators A lower blow-out pressure is generally achieved towards the curved air curtain. In the case of a jet vortex / frontal vortex generator, the larger the distance Exhaust slots the vertical or horizontal jet becomes stronger or weaker, if the corresponding blow-out slots are enlarged or reduced. For egg A thicker blow-out slot applies to a Coanda / frontal vortex generator, and for one Perforated vortex / frontal vortex generator gives a stronger orientation of the blow-out opening in the room.

In this way it is possible with simple means, air curtains or jet seals connections with front vertebrae, especially when combined with fronts valley vortex generators. These air curtains can consist of perforated strips, of slots or generated from other blow-out configurations. Furthermore, it is possible, frontal vortex generators with slot blow-out and hole blow-out to combine other.

In a further embodiment of the invention, individual frontal vertebrae are proposed nerators, e.g. B. on a surface, to use density flows of material limit heavier than the surrounding medium.  

Further areas of application of the method and device according to the invention are bathroom exhaust systems, powder coating systems and painting systems or their Openings, grinding systems, welding stands, or similar systems.

Below, the invention in conjunction with the drawing based on Ausfüh Examples explained. It shows:

Fig. 1 the flow principle according to the invention,

Fig. 2 basic symbols used in the description of the invention,

Fig. 3 shows a beam curtain / air curtain with frontal vortex generators, constructive

Fig. 4 shows a beam curtain / air curtain with frontal vortex generators in symbols,

Fig. 5-9 an embodiment of a Laborabsaugschrankes,

Fig. 10-15 a roller take in a modified form and in various constructive versions,

Fig. 16-21 extraction systems with vertical frontal vortex generators,

Fig. 22 is a side view of a production line with an oven / cooling chamber,

Fig. 23 is a front view of a production line with an oven / cooling chamber,

Fig. 24 is an airlock,

Fig. 25 detection tongues,

Fig. 26-28 Island extractor hoods with work table in supervision or in section.

The flow schematic diagram of Fig. 1 shows diagrammatically by 1 flows, the more readily, and with 2 streams that are heavier than the surroundings, and the terhalb is un a bottom or wall 3 and extend above a top surface or wall 4, where they With the help of frontal currents 6 from frontal vortex generators 5 , e.g. B. from the Coanda type. If the view according to FIG. 1 is viewed from above , the currents spread out on vertical walls 3 , 4 . A wall flow 1 moving to the right or a wall flow 2 moving to the left is limited by the frontal flow 6 emerging from the frontal vortex generator 5 .

The basic type of frontal vortex generators is the jet vortex or jet vortex generator 13 , which can be represented by the basic symbols of wall jet 14 and free jet 15 . The elements 14 , 15 form a frontal vortex generator 16 as a unit. A frontal flow can also be represented with the aid of a Coanda generator 5 , 18 in the form of a basic symbol 17 . The exit direction from the frontal vortex generator 16 and the direction of propagation of the subsequent wall jet 14 can be offset by more than 180 °; such a beam deflection occurs due to the Co anda effect. The basic symbol 19 represents a frontal vortex generator which blows out to the left and is deflected to the right. The use of the basic symbol 16 is supposed to show this possibility represented by the basic symbol 19. The top view or front view of a frontal vortex generator 16 can be described with a common basic symbol 20 because of this "deflectability" to the frontal flow. Suction elements are described by a basic symbol for the surface suction 21 , for the slot suction 22 , for the suction extension 23 and for the suction concentrator 24 . These elements can represent simple openings or filter surfaces of any kind.

In the beam curtain / air curtain according to FIG. 3, a frontal vortex generator 7 is combined with the air curtain 8 . The two beams, namely the frontal flow 9 and the air curtain 10 with z. B. rectilinear flow do not interact with each other. The supply air for the air outlet openings can be supplied with different supply air lines 11 , 12 and thus different blow-out pressures, or optionally with a common supply air line and the same high blow-out pressure.

The combination of the basic symbols 4 and 5 according to FIG. 4 describes this combination of frontal vortex generator with air curtain 25 . The air curtain can by interaction with another beam, for. B. that of a frontal vortex generator, curved GE, as denoted by 26, executed. The associated basic symbol is shown at 27. This can also be achieved with a normal frontal vortex generator, which is designed so that the flow no longer or only partially abuts the associated wall. A curved air curtain is achieved, which is represented by the symbol 27 . Frontal vortex generators can also be directed towards an air curtain, as shown at 28, or can be achieved in conjunction with a double air curtain or a double jet seal, as indicated at 29.

In the illustration of a Laborabsaugschrankes according to FIGS. 5, 6 and 7, the inlet opening 31 of a fume cupboard 30 in plan view (Fig. 5) shown in a side view (Fig. 6) and in front view (Fig. 7), at the frontal vortex generators can be arranged. The front of the trigger is designated 38, the rear wall 37. Rectangular vortex generators 32 a, 32 b, 32 c, 32 d are arranged around the inlet opening 31 , as shown in FIG. 7. The air supply can be made via a movable slide 33 ; this solution is complex. Optionally, a version with two lateral Frontalwir belgeneratoren 32 b, 32 c and a head 32 a vortex generator at the bottom, or only a frontal vortex generator 32 used a at the bottom. Alternatively, an embodiment with only two vertical front vortex generators 32 b, 32 c can also be selected.

The air supply for the frontal vortex generators can be removed via the interior 35 of the fume cupboard. This is shown as an example for the upper frontal vortex generator 32 d. Via a suction element 42 , the supply air is conveyed through a schematically represented line 43 with the aid of a blower 45 to the outlet point 44 . A blower can be assigned to each frontal vortex generator. However, all frontal vortex generators can also be fed with a common fan.

Alternatively, other supply air 46 , e.g. B. for the frontal vortex generator 32 a, or recirculation air of the main fan can be used. External air supply, for example from outside air, is particularly interesting for supply air extraction, since this reduces the room air exchange or saves operating costs.

The suction elements can be point suction, as indicated at 34, optionally with extensions 36 , which are arranged in the storage space of the trigger 35 near the side walls 49 a, 49 b and are connected to the suction opening 47 via lines 48 . Part 41 represents the suction flow. In a modified embodiment, the point suction devices are arranged in the upper ceiling wall 40 . The point suction devices 34 can generate two confluence swirl fields 51 a, 51 b by sucking in the frontal vortex flow 50 , as shown in FIG. 8; the normal roller flow 52 can be observed. The suction can take place in the direction of the vortex structure that forms. The point suction 34 can optionally in the direction of the confluence fields and in the direction of the roller flow 52 by suction elements in the side walls, for. B. 67a, 67b of FIG. 15. This means that by suitable selection of the suction elements, in particular point suction systems, the currents emerging from the frontal vortex generators at a relatively high speed can be combined to form strong vortices.

The downward flow 52 on the inside of the slide 39 can be deflected into the storage space 35 with the aid of a deflection element 53 . Also, a frontal flow 50 emerging from the frontal vortex generator 32 d on the slide can be guided by its own guide, e.g. B. a surface 54 , targeted ge in the storage space 35 , so that the roller flow can be controlled much better.

FIGS . 10-16 represent modified roller deductions with further constructive designs. According to FIGS . 10 and 11, the point extraction can be combined with the conventional extraction (in the form of a known roller extraction) with an upper extraction slot 55 a and a lower extraction slot 55 b become. Existing deductions, e.g. B. with a central suction element 58 behind the air opening 47 , which is connected via an air guiding device 56 to the suction slots 55 a, 55 b, can be built with the help of a front vortex generator 32 a at the lower edge and with the help of two point suction systems 34 into frontal vortex deductions become.

As shown in FIGS . 12 and 13, the frontal vortex flow is controlled by point or other suction elements 86 . The flow 50 must be detected or deflected so that it does not strike the rear wall 63 of the housing too strongly and becomes an outbreak flow by reflection. The flow emerging from the frontal vortex generator 32 a then runs along the bottom 62 , follows the rear wall 63 and generates or amplifies the roll flow 52 . A wall beam 61 serves, in interaction with the head-flow 50 from the vortex generator 32 a frontal one to two surfaces 62, 63 to generate forced vortex flow 52nd A suction element 64 can be arranged opposite the wall jet 61 .

As can be seen from FIGS . 14 and 15, a suction element 65 can be used as an elongated slot suction in the front area of the fume cupboard without point suction ( FIG. 14). In Fig. 15 is a variant with suction elements 67 a, 67 b in the side walls 49 a, 49 b shown. This variant can also be used with a deduction only with vertically oriented frontal vortex generators 32 b, 32 c.

In FIGS. 16-21 is a deduction vertical frontal vortex generator and displayed order directing elements. Fig. 16 shows a plan view of a fume cupboard with two vertical front vortex generators 88 a, 88 b, to which fixed deflection elements 87 a, 87 b connect. These elements serve to improve the inflow into the confluent vortex flows 51 a, 51 b. The blowing flow 90 a, 90 b emerges to the front. Roundings 89 a, 89 b, 89 c, 89 d are provided at the corners to influence the flow in the interior. In the illustration of FIG. 17 in plan view a fume hood is shown, whose frontal vortex generator 91 a, 91 b longer in the plane of the opening 31 of the trigger blows. The control of the blowing flow 92 a, 92 b is carried out by the Umlenkele elements 93 a, 93 b. Fig. 18 shows a trigger with movable control elements 95 a, 95 b and a flow-optimized interior lining 94 . The confluence vortices are better divided by the ridge 96 . Fig. 19 shows schematically the structure of a frontal vortex generator with a movable control element 95, which is comparable to an aircraft aileron. FIG. 20 shows a possible design with a Coanda frontal vortex generator. FIG. 21 shows a trigger in top view with only one confluence vortex 51 c. A frontal vortex generator 98 is provided opposite a sliding door 97 . At this door there is a flow deflection 99 , which is comparable to element 33 in FIG. 8. The suction can be made from the suction opening 100 in the ceiling and / or through elongated vertical suction openings 101 a and / or 101 b on the side wall 102 . Pass-through deductions can be presented by duplicating the concepts presented without a center wall; for this purpose, reference is made to FIG. 22.

Fig. 22 is a side view, Fig. 23 is a front view of a production line with an oven or cold chamber. In production processes, process chambers, for. B. ovens, cold chambers, spray booths or the like 57 through assembly lines 59 . Fig. 23 shows schematically such an arrangement from the front with lateral boundary walls 60 a, 60 b. A suction element is designated 68. At the borders of these areas, frontal vortex generators 16 , 16 a, 16 b or combinations with air curtains in a curved arrangement 27 or in a straight line arrangement 15 can be made. The direction of the limit effect of these frontal vortex generators 16 a, 16 b can be selected or adjusted individually after use in or against the direction of movement of the belt in order to prevent gas from the environment into the process chamber or into the environment from the Process chamber penetrates.

In order to design an airlock in the form of a single jet 69 or a double jet seal to save energy, the air curtain 69 is combined with a front vortex generator 70 according to FIG. 24. The beam seal does not suck in warm air 72 in the upper area. The penetration of cooling air 71 on the floor can be restricted by a frontal vortex generator 15 with a limit direction to the outside. Abge sucks on the floor via element 73 . The supply air for air curtains and frontal vortex housing can be routed via the separate channels 74 , 75 with different air pressures and supply air types or via a common channel.

Fig. 25 shows an arrangement for pollutant detection in which the detection elements are formed as detection tabs. A narrow extension 77 with a Luftzufüh tion 66 and suction surfaces 79 a, 79 b can be introduced into the environment to be vacuumed. The suction elements 79 a are moved, while the Absaugele elements 79 b are firmly mounted in the base plate 78 . The devices shown are designed with a single-sided frontal vortex generator 16 or with a double-sided frontal vortex generator 76 . These units can be designed retractable and are suitable for. B. as a side ventilation element next to or between hotplates (instead of trough ventilation), as a movable suction element for assembly lines or the like.

Fig. 26 shows a detection suction unit, e.g. B. in the form of an island extractor hood, with two pairs of opposite frontal vortex generators 82 a, 82 b, while Fig. 27 shows an island extractor hood with an additional elongated double-sided frontal vortex generator 76 in the middle. In the latter embodiment, the suction surfaces can also be blown with a double-sided free jet, so that a collision of the two frontal vortex flows 50 is avoided.

Instead of a double-sided front vortex generator, a boundary element 84 , which is arranged in the middle, can be used for weaker frontal currents. On work tables, element 84 can accommodate supply lines, while a simple plate is sufficient for island extractor hoods.

FIG. 28 shows an inverted version of the principle according to FIG. 27, which can be used as work table 83 . The surface filters 80 are replaced here by a double slot opening 81 with a suction element 85 arranged behind it.

Reference list

1

Density flow easier than environment / wall flow

2

Density flow heavier than environment / wall flow

3rd

Bottom or wall

4

Top or wall

5

Frontal vortex generator Coanda type

6

Frontal vortex flow

7

Frontal vortex generator FWG

8th

Air vents exhaust slot

9

Frontal flow

10th

Air curtain

11

Supply air frontal vortex generator

12th

Supply air air curtain

13

Frontal vortex generator jet vortex type (based on DE 199 11

850.7

)

14

Basic wall jet symbol

15

Basic symbol of free jet

16

Basic symbol of the frontal vortex generator

17th

Basic symbol of the frontal vortex generator / Coanda type

18th

Frontal vortex generator / Coanda type (based on DE 199 11

850.7

)

19th

Frontal vortex generator with 180 ° deflection

20th

Top view and frontal view

21

Surface suction

22

Slot suction

23

Suction extension (point suction)

24th

Intake concentrator

25th

Air curtain with frontal vortex generator

26

curved air curtain

27

Basic symbol for an air curtain curved using a frontal vortex generator

28

Frontal vortex generator blows in air curtains

29

Frontal vortex generator and double air curtain

30th

Fume cupboard

31

Admission promotion

32

ad frontal vortex generators (FWG)

33

Slider

34

Point suction

35

Storage space

36

Suction extension

37

Back wall

38

front

39

Inside of slide

40

Ceiling of the storage space

41

Suction flow

42

Suction element

43

Line suction element, blower, FWG

44

FWG outlet opening

45

fan

46

Supply air (duct)

47

Suction opening

48

management
49a, b side walls
50a, b, c frontal vortex flow

51

Confluence vortex fields

52

Roller flow

53

Deflecting element

54

Guide surface for frontal flow
55a, b upper, lower suction slot

56

Airflow

57

Process chamber

58

Suction element

59

Assembly line
60a, b side walls, process chamber

61

Wall jet

62

Horizontal area

63

Vertical area

64

Suction element opposite free jet

65

elongated suction element

66

Supply air duct for sliding suction elements
67a, b suction elements in the side walls

68

Process chamber suction element

69

Air curtain

70

Frontal vortex generator airlock

71

Cold air from outside

72

Warm air from the inside

73

Suction element

74

Supply air duct air curtain

75

Supply air duct FWG

76

double-sided frontal vortex generator - schematic construction

77

movable extension

78

Base plate
79a, ba) movable, b) fixed suction elements

80

Surface suction

81

Double slot
82a, b pair of opposite frontal vortex generators

83

Worktable

84

Demarcation element

85

Suction element

86

Suction element
87a, b fixed deflection element
88a, b vertically oriented frontal vortex generators oriented outwards

89

ad rounding of corners
90a, b blowing or frontal vortex flow
91a, b frontal vortex generator oriented in the plane of the suction opening
92a, b frontal vortex flow
93a, b control elements

94

Interior lining
95a, b movable control elements

96

Ridge for confluence vortex division

97

sliding door

98

Frontal vortex generator - single cell deduction

99

Flow deflection sliding door

100

Exhaust opening ceiling
101a, b elongated suction openings in the side wall

102

Side wall

Claims (32)

1. Method for confining, capturing and suctioning off fluid flows that are heavier or lighter than the surrounding medium by blowing out, since characterized in that a single frontal vortex generator is arranged with the exception of the assignment on an underside in any orientation in space. 2. Method for confining, capturing and aspirating fluid flows are heavier or lighter than the environment, by blowing out, thereby known records that at least two frontal vortex generators are spatially offset Orientation and assignment can be combined. 3. The method according to claim 1 or 2, characterized in that at least egg ner of the frontal vortex generators optionally with slit suction and / or Point extraction and / or surface extraction is used in combination. 4. The method according to any one of claims 1-3, characterized in that mind least a frontal vortex generator with at least one straight or ge use curved free jet and / or at least one wall jet combined det. 5. The method according to any one of claims 1-3, characterized in that mind Mostly a frontal vortex generator for generating curved or straight lines Air curtains is used. 6. The method according to any one of claims 1-3, characterized in that mind Mostly a frontal vortex generator with stationary or movable control elements ten is used.   7. The method according to any one of claims 1-6, characterized in that fron Valley vortex generators with slot blowing and hole blowing, with a straight line or curved outlet slot or straight or curved perforated strip can be combined with each other. 8. The method according to any one of claims 1-7, characterized in that fron Valley vortex generators with a free space opposite each other arranges and arranged in horizontal, vertical or between horizontal and vertical orderly orientation. 9. The method according to any one of claims 1-7, characterized in that fron Valley vortex generators arranged on a surface opposite each other in a horizontal, vertical or intermediate orientation. 10. The method according to any one of claims 1-7, characterized in that fron Valley vortex generators can be arranged back to back. 11. The method according to any one of claims 1-10, characterized in that mind at least one frontal vortex generator at the top of either fixed or off mobile tongue is arranged, and that suction surfaces stationary or ver be slidably arranged. 12. The method according to any one of claims 1-11, characterized in that fron Valley vortex generators within a room, for example one in a room leading opening ring-shaped, in pairs opposite, U-shaped or individual be arranged duel. 13. The method according to claim 12, characterized in that confluent eddy currents can be generated by point, slot or surface suction.   14. The method according to any one of claims 12 or 13, characterized in that a controllable and controllable flow through guide, form or suction elements in an interior, preferably a fume cupboard, in an exterior (preferably extractor hood) or in a semi-open space (preferably Airlock) is generated. 15. The method according to any one of claims 1-14, characterized in that the Blown air optionally with separate blower for each blow-out element, or with ge common blower for multiple blow-out elements is generated. 16. The method according to any one of claims 1-15, characterized in that outside air and / or recirculation air is used as blowing air. 17. The method according to any one of claims 1-16, characterized in that the Flow structure in closed, one-sided or two-sided open Cleared with the help of the currents from the frontal vortex generators becomes. 18. Device for carrying out a method according to one of claims 1-17, characterized by the use of frontal vortex generators for currents conditions that are heavier or lighter than the environment and that correspond to the Orientation and combination of requirements in any room are. 19. trigger device according to claim 18, in particular laboratory fume cupboard, characterized records that supply air is introduced into a fume cupboard using the blowing elements becomes. 20. Device according to claim 18, characterized in particular for fume cupboards indicates that recirculation air is introduced into the fume cupboard.   21. Device according to one of claims 18-20, in particular fume cupboard, thereby characterized that the blowing flow in the fume cupboard and the flow in within the fume cupboard by fixed or movable guide elements the frontal vortex generators, as well as flow-optimized interior lining gene is influenced or controlled. 22. The device according to claim 18, in particular airlock, characterized net that single or double jet sealing with frontal vortex generators are combined, and that depending on the requirement in the direction of action are switchable or switchable. 23. Island extractor hood device according to claims 1-14, characterized records that at least two frontal vortex generators on a suction surface are arranged opposite one another. 24. Device according to claim 23, characterized in that between the outer ren frontal vortex generators a frontal vortex generator arranged on both sides or an outlet for a wall jet on both sides towards the suction surfaces is ordered. 25. Device according to claim 23, characterized in that between the outer ren frontal vortex generators a boundary surface is provided. 26. Device according to claim 18, in particular process cabin, characterized net that pollutants with the help of Fron valley vortex generators are detected, delimited and suctioned off. 27. The device according to claim 18, in particular extendable detection elements, since characterized in that the air flow for the Frontal vortex generators are made and that optionally adjustable suction surfaces  are provided. 28. Device according to claim 27, characterized in that frontal vortex genera gates are arranged on one or both sides. 29. Device according to claim 28, in particular work table, characterized net that frontal vortex generators on two opposite table edges are arranged, and that a double slit suction is provided in the middle, the through a boundary surface or a two-sided frontal vortex generator is divided. 30. Device according to claim 18 or one of claims 19-21, characterized ge indicates that there is a frontal vortex generator in front of the lower inlet opening seen and that in the upper area towards the opening two point suction elements te are provided. 31. The device according to claim 30, characterized in that the fume cupboard as Pass-through deduction is carried out. 32. Device according to claim 18 or one of claims 19-21, characterized through a vertically oriented frontal vortex generator in connection with a horizontally sliding door.